Fig. 1.

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Spectrum and fit of the kilonova AT2017gfo spectrum for epochs 1 and 2 (days +1.43 and +2.42). The dotted line on the right side indicates the offset (7 × 10−17 erg cm−2 s−1 Å−1) added to the first epoch spectrum, the dark shaded bars indicate telluric regions, and the light shaded bars indicate overlapping noisy regions at the edges of the UVB, VIS, and NIR arms.
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